Non-return valves

Non-return valves prevent the working medium from returning during its flow thrugh the installation. Flangeless valves are equipped with connector pipes with dimensions in accordance with PN-80/H-74219 norm and with DIN 2448 standard (marked additionally with symbol: /D). Differences in dimensions are showed in the tables. They can be either throughway or angle valves, bolt and with or without flanges. Valves’ leaktightness in closure position is secured by P.T.F.E. gasket pressed down by the valve head. The casing is made from welded high resistance P355 steel. The valve head is made of aluminium alloy.